I running the water in my kitchen sink and it suddenly got real brown and then the pressure got real low. Now when I cut the water on, there is about 1/2 the normal pressure at first then it goes to very little water coming out. Every time I cut it off then on again it repeats the same thing. This occurs in my cold, hot water and water sprayer. Is there anyway I can fix this myself or do I need a plumber? Thanks.